Handleiding Charnwood LA45 (pagina 13 van 18) (Engels)

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heating. Where a common return is used an injector tee must

be incorporated into the system as shown in Fig. 10. This will

ensure that a good domestic hot water supply is maintained

when the central heating pump is operating. These are available

from Charnwood if you are unable to obtain one locally.

The system must incorporate a gravity circuit which will

normally heat the domestic hot water and an unvalved radiator

with an output of at least 1 kW. When the appliance is not

connected to a domestic hot water system the unvalved

radiator(s) on the gravity circuit must have an output of at least

1.25 kW. This is to prevent boiling in case of pump failure. All

pipework in the primary circuit must be 28 mm diameter and

the gravity flow pipe must rise continuously from the boiler to

the open vent. Two typical systems are shown in Figures 8. and

If the appliance is used to heat a small central heating system

then the heat output to the room from the fire will be reduced.

Fig. 5. shows the ratio of space heating to water heating which

can be expected.

Fitting a radiator in the same room as the fire is recommended

as it will allow greater flexibility in the way that the system is

operated as well as ensuring that there is sufficient heat.

SYSTEM CONTROLS

The circulating pump may be controlled by means of time

switches, room thermostats or outdoor thermostats. Radiators

may be either manually or thermostatically controlled. These

controls will all work in conjunction with the thermostat on the

appliance and the minimum return thermostat.

We recommend fitting a pipe thermostat onto the gravity

return pipe and wiring it into the mains supply to the pump so

that if the gravity return temperature drops below 45°C then

the pump will cut out. This will help to prevent condensation

forming on the boiler faces and will thereby increase the life of

the boiler. It will also ensure that priority is given to the

domestic hot water. These thermostats are available from

Charnwood if you are unable to obtain them locally.

FITTING THE FIRE

In some cases it may be necessary to place the connecting flue

pipe in the chimney before fitting the fire into the fireplace.

Apply fire cement to the rear face of the sealing flange on the

INSTALLATION INSTRUCTIONS charnwood

Vermiculite

Infill

Flaunching

Short Length

or Flue Offset.

Of Flue Pipe,

Fig. 11. Typical Installation

appliance. Fit the appliance into the opening ensuring that it is

central and that a good seal is made between the sealing

flange and the face of the surround.

Remove any excess fire cement from around the sealing

flange.

The fire should be screwed to the hearth through the holes at

the base of the sealing flange.

Connect the heating system to the boiler ensuring that the

primary flow pipe rises from the appliance. Fill the system

with water and check for leaks.

FLUE CONNECTION AND INFILLING

Make the flue connection with a short length of 150mm (6”)

internal diameter flue pipe (cast iron to BS41:1973, 1.0 mm

thick stainless steel, or 5.0mm thick mild steel).

The end of the flue pipe must line up with the centre-line of

the chimney, and must also extend to the point where the

chimney narrows to its final size. Any large voids must be

filled and flaunched to the flue pipe to ensure that all soot

deposits can be cleared when the chimney is swept. If

necessary a flue offset is available. The offset may be used

directly with stainless steel flue pipe or may be used with cast

iron flue pipe in conjunction with a cast iron adaptor. If the

flue pipe has to be set at an angle then cut the ends so that it

sits correctly.

Ensure that the flue pipe is not obstructed or restricted in any

way and that all joints are well sealed.

Before infilling cover the front of the appliance to protect it.

Ensure that the flue pipe is central and then fill the space

between the body of the appliance and the structural

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